“Our investigation is independent from legal action taken in the state where the crime was committed.”

Agence France-Presse reported that the Warsaw district prosecutors’ office said on Friday that it planned to ask British authorities for their cooperation.

The Guardian further reported that the Polish foreign ministry said it would raise the issue of attacks on Poles living in the UK with Johnson.

The discussion follows an earlier talk between Johnson and his Polish counterpart, Witold Waszczykowski, at a meeting of foreign ministers in Potsdam this week.

According to the newspaper, Waszczykowski said that, at that earlier meeting, Johnson “promised to address the issue” and gave assurances that the “UK government does not accept the hate action against migrants and it will do everything to protect Poles and other foreigners against aggression”.

Chris Radburn/PA Wire

People attend a vigil in Harlow to pay tribute to Arkadiusz Jozwik

An estimated 800,000 people born in Poland live in Britain, while many other people have Polish ancestry following a migration of 200,000 people after the Second World War.

The Polish foreign minister has reportedly suggested that an educational campaign should be introduced in Britain “so as to make people aware that Brexit will not mean throwing immigrants out from the UK”.

Speaking at the scene of the killing on Wednesday, Arkady Rzegocki, Poland’s ambassador to the UK, said the tragedy could not be seen in isolation.

“Unfortunately there is much more after Brexit. We have found about 15 or 16 such situations. It is a very important tragedy and we have to work together on this issue,” he said.